[CMake] manipulating tests that are defined in a subdir

[Paul Seyfert]

Dear all,
(essentially asking what I already posted on SO
https://stackoverflow.com/questions/54447765)

I have a my_project/CMakeLists.txt file under my control. In its directory
there is also a git submodule (say 'my_project/sub' for now), and I add the
git-submodule on the cmake level though add_subdirectory(sub). The
submodule is not under my control (well, I can fork it of cause, but we'd
prefer not to have diverging branches, and the other way around, we don't
want to pollute the submodule with my-project specific stuff).
Because of my (admittedly strange) production platform, the tests from sub
fail in my project.

I can fix that by changing properties of the tests with
`set_tests_properties(test_in_sub PROPERTIES ...)`.

However since the tests are defined in my_project/sub/CMakeLists.txt and I
don't want to have my_project specific bodges in sub, I would like to call
set_tests_properties from my_project/CMakeLists.txt.

When trying to do so, cmake reports that the test I'm trying to manipulate
wouldn't exist. Things work when I call `add_test` and
`set_tests_properties` from the same CMakeLists.txt file.

My question thus is: Is it possible to call `set_tests_properties` for a
test that is `add_test`ed in a different CMakeLists.txt file, and if so
how? (Well, and if not, I'm happy for other suggestions)

Thanks in advance,
Paul
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